Great Grievous! Could you do a partially constructed picture so that we can see how to build it? Thanks._________________Am I the only one who sometimes comes here, logs in, and fools around?
Life finds a way. ~Ian Malcolm, Jurassic Park

Well done, a simple but very effective Grievous moc using unmodified parts. The only thing I don't like is the clip-on feet (Lego never does this in official sets), but pretty much every custom Grievous I've seen uses this technique so I guess it's the only way to do it.